Clutch guard for pin stems



Feb. l5, 1927. J. J. HALLIHAN CLUTCH GUARD FOR PIN s'rmd's Filed oca. 2a. 1925 A, .Nl s. f. M. H .51.. YN N L. I. A

Patented Feb. E, 1927.

JOHN J. HALLI'HA'N, `or CHABTIJEY, vMAssaturosemis,l .assIGNoB To rarx'nivi'hYN.v DAUGHADAY co., or QHARTLEY, MASSACHUSETTS, A coaPonroN o'rnas's'n'# CHU-seres, ALSO noINe-BUsrNnss As' PaovInENcn-*corran BUTTON' COMPANY', or

rRoViDENcE, RHODE" ISLAND.

CLUTCH GUARD FOR' PIN STEIVIS Application led October 28, 1925. SerialJ No'. 65,474.'

This invention relates to a guard of the clutch type for pin stems and the like, and has for its object to provide such a guard, the body and operating members of which 5 are drawn up orformed from sheet stock to reduce the amount of metal employed and the cost of manufacture. y

The invent-ion further consists in the limproved method of producing a clutch guard l0 of this character from sheet st'ock, which consists in drawing up the body portion lfrom sheet stock into tubular form having a tapering end portion and drawing up the ball carrying and operating member from sheet stock into tubular form and upsetting one end of the" tube by an axial pressure to thi-cken the stock and provide al bearing or cage for the clutchballs; also pressing inwardly the side walls adjacent the folded walls to form lateral yguides for' the'balle mounted'therein and inserting and operatively securing` the tube in the body memberv lVith` these and other "objects inA View, the invention consistsl of certain novell features of construction, as will be morev fullygdescribed, and particularly pointed out inthe appended claims.

In the accompanying. drawings:

Figure 1 is a side elevation show-ingi my improved 'clutch as applied to the stem of a scarf pin.

Figure 2 is a side elevation of the housing or body portion havingr been drawn from sheet stock into deep cup shape.

Figure 3 is a sectional elevation showing one end portion of the body as tapered Vand its opposite edge as beveled or drawn to a thin edge.

Figure 4 shows the operating tubular member as drawn from sheet stock into deep cup shape with a flange at its lower edge.

Figure 5 shows the shank portion intermediate the ends of this deep cup as having been reduced leaving an enlarged head r portion with the stock at the shoulder folded back upon itself, and the side walls of the head set inwardly toward each other.

Figure 6 shows the end of the head as drilled to receive the pin stem ,and the sides of the head drilledv to receive the clutch balls and the flange portion removed.

Figure 7 is a side elevation taken at right of advantage from aV manufacturing'stand point2 to form the partsv of a clutch guard of this type ofsheet'stock by drawing. and swaging operations vrather thanbythe old method'- of forming the parts from sol-id stock; andthe following is a detailed de scription of the present embodiment of my invention and showing. onemeans and. describing one method by which these advantageous results may be produced 1 Vith reference. to the drawings, 10 des'- ignates the body member of my improved clutch/guard, the same being. drawn up into a deepcup-shapedy member, as illustrated in Figure 2, the sidewalls' 11?- at one end of the cupbeing tapered: for the purposepresently described, and theedges 12 at the opF posite endofrthe bodyy arezpreferably beveled outwardly as best shown` inl Figure 3, to render this edge more bendable, nextV the inner or operating member 13 is drawn up from sheet stock, preferably by a drawing and swaging operation into a deep cup or tube having a flange 14; at one end, its upper end portion being tapered as at 15. The shank portion 16 of this member is then reduced,`preferably by al hammering operation between the tapered head portion 15 and the lower end portion 17, neXt I apply an endways pressure to crush or upset the head or end portion of this member thus folding the stock of the walls back upon itself as at 18 forming a shoulder or thick ened portion to serve as a bearing as at 19 for the clutch balls, I then press the side walls of the head portion inwardly as at 2O and drill slightly larger than the balls through from side to side on a line with these inset portions thus providing adequate guiding walls or tracks for the clutch balls,

I then drill into the outer end ofthe head removing the crushed-in stock 22 to form an opening 23 for the passage of the pin stem to be engaged by the clutch balls, I then cut oir the iiange 14: and bend the severed edges 2a inwardly into spherical shape as best illustrated in Figure 7, with a hole 25 at its lower end through which the pointed end of the pin stem may pass.

In assembling the parts I now place the two balls 26 into the transverse opening or track in the head which now forms a cage for the balls, insert this tubular member carrying the balls into the body member 10 so that the balls will lie against the inner tapering faces or' the upper end of the body member. A spring 27 is then inserted into the body, one end 28 engaging the under side of the enlarged head portion of the tube and I then turn the beveled edge l2 or' this body inwardly to provide an abutment for the opposite end 29 of the spring. The. device is now assembled and in position so that when the shank of the pin stem is passed from the upper end down through the tube the clutch balls will act upon the inner tapering surface of the body upon being pressed inwardly by the spring to grip the shank of the pin stem and so prevent it from being` withdrawn except when the lower end portion 17 of the tube is drawn downwardly endwise relatively to the body thereby releasing the balls from engagement with the tapered walls permitting them to move outwardly and so release the pin stem 30 to be freely withdrawn.

Having thus described one illustrative embodiment of my invention and the best mode known. to me for carrying out my method, I desire it to be understood that although speciic terms are employed, they are used in a generic and descriptive sense and not for the purpose of limitation, the scope of the invention being defined and limited only by the terms of the appended claims.

I claim:

l. A clutch guard for pin stems comprising a tubular body member formed of sheet stock with tapering walls at one end, a tubular pin stem receiving clutch operating member formed of sheet stock and having one end in said body the said end being upset and enlarged forming a ball cage with openings in its opposite side walls, clutch balls in said cage, and a spring pressing said member inwardly to carry said balls into engagement with said inclined walls and by action of said walls into gripping engagement with the pin stem when positioned in the guard, and an integral hollow enlargement at the opposite end of said clutch member outside of said body for manual engagement for operating the same, the said enlargement having an opening in its end of a size substantially the size of the pin stem to guide the same in its movement.

2. A clutch guard for pin stems comprising a tubular body member formed of sheet stock with tapering inner walls adjacent one end, and a tubular pin stem receiving clutch operating member formed of sheet stock and having one end in said body, the said end being upset and enlarged, the side walls of this enlargement being set inwardly to provide lateral ball guides and having holes through its opposite side walls at the ends oi the guides, clutch balls in said guides, and a spring acting between said body and member to move Athe balls into engagement with the inclined inclosing wall causing them to grip the pin stem, and an integral hollow spherical enlargement at the opposite end of the clutch member for manual engagement for operating the same.

In testimony whereof I affix my signature.

JOHN J. HALLIIIAN.

(Sil 

